Humidity controlling system



July 8, 1952 G. w. BASINGER 2,602,589

' HUMIDITY CONTROLLING SYSTEM FiledMay 51; 1950 v 2 SHEETSSHEET 1 1COMPRE5SED WATER I Am TANK RESERVOIR I r]! II I II III/I III IIlII I IIII! I II II I IIIIIJJ -3l 4 24 I (/1 I a V 34 24c Hi 2- ELECTRIC I83I84 50 TIMER R bd 56 V I7! 55 I64- if .l EH53 no INVENTOR GL'ORGE WBASINGER.

ELECTRIC PNEUMATIC RELAY ATTORNEYS July 8, 1952 G. w. BASINGER 2,602,589

HUMIDITY CONTROLLING SYSTEM Filed May 51, 1950 2 SHEETS--SHEET 2 /{4?1 J66 62 75 7, V hm Pg 7 Z 1 I INVENTOR 650005 N bum/05E.

5X Cafm *M ATTURNl-IYS Patented July 8, 1952 UNITED STATES PATENT OFFICEHiJMIDITY iJONTROLLING SYSTEM iGeorgW. 'Ba s inge'r, Charlotte, N. C.Application Mi-y 3-1, 1950, S BiialBT11);165,339 -1 Claim. (Cl. 236 44:)

This iiivrltion relates teen improved humidity controlling system forregulating the flow of compressed air to the usual; atomizers associatedwith the usual types of humidity controlling "sys-' temsemplo'y'ed inindustrial plants and particularly in plants wherein textile materials"are processed.

The primary object of -this invention is to provide an improved meansfor maintaining :a uniform percentage of humidity in a given parcel ofair without'd'epending solely upon a hygrostat as the i'nedium forcontrolling the admittance of compressed air to the humidifiers foratomizers.

l-t' iswel-l known, to thos'e'familiar with :the art, that the usuall-humidifying systems include .a plurality of atomizers or humidifiersto which moisture is admitted and to which compressedcair is alsoadmitted to mix with the moisture and this how of compressed air to thehumidifiersis usually controlled by a so-called blow-through or reliefvalve, the opening and closing of which is controlled by -compressedair.

Her-etofore, an instrument, usually a hygrostat or a hydrostat; has beenemployed for effecting the opening and closing of thepneumatic-relieivalve-of the type heretofore described for admitting compressed air tothe atomi'zers. This particular type of instrument-includes ahygroscopic element responsive to variations in humidity, and suitablepneumatic connections have been provided'for opening and closing therelief valve in response to the hygroscopic element. However, thehygroscopic element has not always responded promptly to the function ofthe atomizers with the result that there would often be a completesaturation of the atmosphereadjacent the atomi'zer's'before the moisturein the atmosphere could affect the hygroscopic elementto,-in-tui'n,close the relief valve and stop the-flow of compressed airto the atomizers.

It is, therefore, an object of this invention to provide an improvedmeans for intermittently opening 'and'closing the relief valve forpredete'r mined relatively short intervals the period at which therelief valve normally remains open, so "the compressed 'air isintermittently admitted to "the 'ato'mizers at like intervals, thuspermitting the moisture from the atomizers to be more evenly dispersedabout the room in which the atomizers are disposed and to produce thedesired effect'onthe'hygroscopic element of the hygrostat before theatomizers will have saturated the atmosphere.

Somef the objects --of the invention having been stated-o'thei' objectswill-appear as :the de 2 scription proceeds 'when taken in connectionwith the accompanying drawings, :in -which Figure l is a schematicillustration of a typical humidity controlsystem as it might beinstalled in a building; Y

Figure 2 isan enlarged view of the pneumatic relife valve orblow-through valve control unit with the cover removed;

- Figure :3 is'an enlarged elevation of an electricpneumatic relay withthe .cover thereof removed, and with parts brokenlawayand in section,this relay also being shown in the right-hand lpwer portion of Figure 2;

Figure 4 1s .an enlarged vertical sectional view taken'substantiallyalong the line 4-4 in Figure 2 and showing a pneumatic relay removed.:trom the panel shown in Figure .25

Figure 5is' an elevation of a typical electrically operated timer withthe cover thereof removed, this timer also being shown in the upperrighthand portion'of Figure2;

Figure fiis an enlargedelevation of a hygrostat with thelcover thereofremoved andwhich isalso shown in the left-hand lower portion of Figure,2;

Figure 7'--isa--viewlooking at the opposite side of the .hygrostat shownin Figure 6; I V

igure 8 -is1a vertical sectional view taken substantially alongthe lineli t in Figure 4.

Referring :more specifically to "the drawings, the numeral ill indicatesa portion of -a;building in which the improved humidity controllingsystem is adapted tobe disposed. The building 10 includes opposed-sidewail-ls l l and I 2, a first :floor 1:3 and .a second floor .I 4.

The arrangement of the humidity control system :other than that employedin controlling the blow throu g-h or pneumatic relief valve to be laterdescribed, is show-n by way of illustration only since it is evidentthat there are many d-i'f ferent ways in which the'huinidity controlsystem may be installed. In -a humidifying system,fa suitablereservoir20 is usually provided and which is preferablyrdisposed at a higherelevation than a plurality of spaced atomizers or humidifier nozzlesz iso that water will flow from the reservoir 20 through a pipe 22 whichcommunicates with the atomizers 2| to thus direct manner from thereservoir 20 to the atomizers 121 by gravity. A compressed air pipe :23is :also connected to the atomizers 2| and this pipe v23 is connected toone side of a pneumatic pressure relief valve 25, thisvalve 24 alsobeing knownto the-art as ablow throug h valve. The valve i4 is shown, inFigure 1-, as enlarged relative to 3 the atomizers 2i for purposes ofclarity and will be later described in detail.

The pressure relief valve 24 has a pipe 25 connected to the end thereofremote from the end to which the pipe 23 is connected. This valve 24 isof a type such as is controlled for opening and closing by compressedair admitted to the valve 24 by a pipe 26, this pipe 26 being connected,at its end remote from the pressure relief valve 24, to a pneumaticrelay broadly designated at/21 and disposed within a housing or on acontrol panel of a control unit broadly designated at 30. This controlunit 30 broadly represents a compressed air control apparatus which is apart of the present invention and will be later described in detail.

The pipe 25 from the pressure relief valve 24 is connected at its endremote from the relief valve 24 by a pipe T Blato a pipe 3|. The pipe 3!is connected at its end remote from the pipe T 3Ia to a compressed airtank 32 to which compressed air is admitted by a suitable air compressorrepresented by a motor 33.

The end of the pipe BI'remote from the compressed air tank 32 isconnected to one side of a regulator valve 34 to the other side of whicha pipe 35 is connected, this pipe 35 extending from the valve 34 andentering the housing 30 (Figures 1 and 2). It is the usual practice toprovide approximately thirty pounds per square inch of compressed air inthe pipes 31 and 25 and which will be admitted to the atomizers 2|through the pipe 23 upon the pressure relief valve 24 being opened in amanner to be later described. It is preferable that the flow ofcompressed air be regulated for controlling the various control elementsin the control unit 30 at a substantially lower pressure than that whichpasses through the pipes 3! and 25. Therefore, the regulator valve 34 isprovided and may be a type which will sub stantially reduce the poundsper square inch of compressed air passing through the pipe 35, thispressure preferably being fifteen pounds per square inch. 7

It is evident that the control unit 30 need not necessarily be a housingsince all of the instruments within the housing may be exposed if sodesired. As a matter of fact, in order that the hygrostat 43, to belater described, may respond to the changes in relative atmospherichumidity, it is essential that this hygrostat be disposed so that theatmosphere may circulate through the hygrostat. Although this pneumaticvalve control unit 35 is shown as a unit mounted in a housing or on asingle control panel, it is to be understod that these parts may bedisposed remotely from each other if desired, the showing in Figure 2being a preferred arrangement of these elements. In Figure 1 the housingof the control unit 30 is shown provided with a hinged cover 36 which isomitted in Figure 2 for purposes of clarity.

The pipe 26, connected to the pneumatic relay 21, preferably has aconventional bleeder valve 40 interposed therein. The side of thepneumatic relay 2'! remote from the side to which pipe 28 is connectedhas a pipe lla suitably connected thereto and thi pipe 4m is connectedto a pipe T 4| which also has the pipe 35 connected to one branchthereof. The branch of the pipe T 4| remote from that to which the pipe35 is connected has one end of a pipe 42 connected thereto and this pipe42 is connected at its other end to one side of a hygrostat broadlydesignated at 43, to the other side of which one end of a pipe 44 isconnected through the medium of a pipe T 45. The other end of the pipe44 is connected to the lower end of the pneumatic relay 21. Thepneumatic relay 2? and the hygrostat 43 will be later described indetail.

The pipe T 45 also has one end of a pipe 41 connected thereto, this pipe41' communicating with an electric-pneumatic relay broadly designated at5B and which will, also be later described indetail. r

The electric-pneumatic relay 58 also has a pair of wires 5| and 52extending therefrom which extend to and are suitably connected to anelectric timer broadly designated at 54, this electric timer 54 alsohaving wires 55 and 56 extending therefrom and being connected at theirother ends to a suitable source of electrical energy, not

shown.

Now, the pneumatic relay 2?, the hygrostat 43, the electric-pneumaticrelay 50 and the timer 54 are independently conventional elements andthere are many diiferent types of elements similar to the elements 21,43, 50 and 54, which may be employed in lieu of the elements 21, 43, 55and 54, the particular types of elements shown in the drawings beingshown by way of illustration only,

The invention resides in the combination of theserelays 2! and 5B, thehygrostat 43 and the timer 7 54 which are arranged so as to produce notonly a controlled reaction of the pressure relief valve 24 to changes inatmospheric relative humidity, but also to intermittently open and closethe pressure relief valve 24 at periods during which the pressure reliefvalve 24 would normally remain open, as would be the case during periodsof relatively low relative humidity of the surrounding atmosphere.

The pneumatic relay '2'? may be of a type such as is manufactured byMinneapolis-Honeywell Regulator Company, Minneapolis, Minnesota, shownon a sheet issued by said company and identified as Form 95-1001-A undertheir type number RO49A2 and which is commonly termed a positive'or snapacting diverting relay. Since this pneumatic relay 2? is independently aconventiorial element, the details of the same shown in Figures 4 and 8are given merely to illustrate its manner of operation rather than itscomplete structureand its description is based accordingly. Thepneumatic relay 2! may include a cast body member 50 suitably secured,as by screws cm (Figure 8), to a base member 5:, this base member 5ibeing adapted to be secured on the panel of the control unit so as byscrew 61b.

The base member 5| has a common chamber or channel 84 in th right-handface thereof, in Figure 4, which communicates with the chambers 62 andB3. The chambers 52 and 8 3 have respective spring loaded valve members.55 and 66 which are normally urged against the restricted outer ends ofthe chambers 62 and 63. A lever or plate 78 is provided with a pair ofadjustment screws H and 22 which are alternately moved into engagementwith the right-hand ends of the respective spring loaded valve members65 and 66 through the medium of a flexible gasket '13. This gasket 13 isadapted to close the channel 54 and is held in place by a block '74secured against the gasket 13 and the base member 6! by screws l5. Theblock 14 has suitable openings 15 and 'H therethrough which are looselypenetrated by the adjustment screws H and 12.

A pivot screw threadably embedded in the plate 10 has one end of atorsion spring 8| pivotis pivotally connected to alev'er 82. The lever82 is'oscillatably mounted intermediate its ends,

as at 83, on 'a-movable plunger 84. The end of the lever 82 remote fromthe end which is'con nectedto the torsion spring BI is -pivotal'lymounted, as at '85 on theb'ody member 60;

It'will be noted that this plunger- 8'4'is'n0'rma1' ly'urged downwardlyin Figure 4 by a compression spring 86 which bears against a pilot 8!and is adjusted as to compression by an adjustment screw 90 bearingagainst the upper wall ofthe body member 50 and threadably embeddedinthe pilot 81. Thebody member 6t) has a first diaphragm chamber 9'Itherein in which an enlarged portion 9-2 of the plunger 84 is disposed,thisportion 92 being either an integral part of the plunger 84 or beingsuitably secured thereto as shown in Figure 4. The plunger 92, has aflexible diaphragm 93 suitably secured thereto and this diaphragm 93 isheld against the lower surface of the body member 68 bye suitable flange94 which has asecond diaphragm chamber 95 therein. This flange 94 hasthehpipe' respective chambers 62 and 63. The base member "G I' has oneendv of the pipe 41a connected thereto and communicating with thepassage- Way '9"! anda tubular pipe plug Illll is provided so that oneend of the-passageway 95 is open to the atmosphere. a p'as'sageway IOI(Figure 8) therein which communicates with the channel 64 and alsocommunica-tes with the'pipe III whichifs; suitably connected to the base61, This completes the structure of the pneumatic relay 2] and itsmanner of operation will belater described. v

The hygrostat 43 is shown in detail in Figures 6 and 7. This hygrostat'43 may be of a type such as is manufactured by Taylor InstrumentCompanies, Rochester, New York -and is shown on their drawings numbered6547 and 6548 relating to a Taylor room-type hygro'stat Thejparticularhygrostat 43 shown Figures 6 and 7 corn-prises a hollow base .niemberH0, on theyouter face of which an adjustment level III is-mounted foroscillation, as at H2, its right-- hand portion-i-nFigure 6 being "heldin adjusted position by an adjustment 'scrw H3 and a coma pressionspring H4 bearing against a projection II- on the hollow base niembetIIB. "Thelfthand portion ofthe adjustment lever -I 'II has the lower endof a hygroscopic element designated broadly "at .II'I connected thereto;'This hy roscopic element I ITincludes apluralityof strands I2'nwhlchare res onsive to changes in 'a'trho's puene relative humidityto'move stirrups' I -2I and-I22; to vvliichf'tliey are connected, relativeto each other. V

The lower stirrup I2! is connected'by'a tie neck 1' 23 "to theleft-handpo'rtion or the "adjustment'lever I I I. The upper stirrupIZZis piVOtally connectedI interme'diate'the'ends or a bafilejmbe'rjl'25 which is supported by ale'af spring member I26, this leafspring member being projected upwardly and beingfixed, as by a pressedfit, in a'projection I 2'I integral with a bailie adjustment leverI3B;adjustab1y 'secured on theFouterface-of the base member Hit, byanysuitable means such as screws j I 31; and flf32, thisbaiile-adjustmentlever being adjustable-so as to The base member 6-Ialso has projects -from the front or outer-"face of the'hol low basemember III). I I The bleed-off hoz'zle 134 has a; passa eway I35"therein which is adapted to at times to be closed-'- by the bafile I25,this passageway Itdcomrimni i I eating with a hollow projection I36 onthe rear surface of vthe hollow base member III]. A conventionrestriction pin I31 is provided "for ad ju'sting the size of thepassageway I 35 atfit's" point of communication with the hollowprojec=-' tion I36. It will be observed in Figure 7 that the hollowbasemember I II} has a pair of spaced projections" I48 and MI integraltherewith which-are lpro videdwith respective passageways I42 and H43and to which therespective pipe: 42, and pipe '1 45 are connected. Theends of the projections- I40 and HSI remote from the ends to which the"respective pipe 2 2 and pipe T are connected have respective pipes M5and I45 connected thereto, the passageways I42 and I43 serving as" themeans of communication between the "pipes"- 42 and ldfiand the pipe T 45and pipe 146. Itmay be observed in Figure 7 that the projection I35 isof substantially less 'length than the. Width-Of the hollow base memberH0 and the right-hand end thereof-has the end of the pipe; I46 remotefrom the projection I4'I connected thereto. The end of the pipe I45remote from the projection I40 is also connected and'commu nicates withthe hollow projection I35. One end of a pipe I59 also-communicates'withthe-hollow projection I35 and its other end is connected intermediatethe ends of a horizontally disposed substantially tubular aspiratornozzle l-5I projectingfrom the rear surface of the tubular base,member-H0. r The hollow base-member I II also has a tubular portion I52projecting therefrom and. forming --a venturi, this tubular portion I52being providedwith a bore I53 which communicates with thetubularasplrator nozzle I'5I. The base member III! has an opening I54therein which communicates with the bore I 53 in'theventuriI 52.

In operation, compressed air flows continuously from the compressed airtankfiZ through the pipe. 31-, regulator valve 34, pipe 35, pipe T M andpipe 42 to the hygrostat t3. The compressed air'then flows through thepassageway I42 inthe projec tion I49, through the pipe I45, through thehollow projection I36 and-through the pipe IED-and finally through theaspirator I5I 'to be ventedthrough the venturi I52. It is Well known,tothose familiar With the art, 1 that the --movement of compressedair'past the opening I54 willcause air, to circulate past the medialportion of the strands I28 of the hygroscopic element -I H, through theopening I54 to thus assist in circulating the atmosphere, in the room inwhich-theatomizers 2I are disposed, past the hygroscopic element H1.

The pneumatic relief valve 24 maybe ef cen- I ressures adapted to passto the an)r'n izejrs lifI 5 when the air valve member24b is unseated.The

pressure on the diaphragm24a is counteracted by a spring 24d and saiddiaphragm is connected with the air valve 241? through a stem or thelike 24a. The stem 24c also carries a second valve member 24] adapted toengage the bleed-ofiport 24g in the housing 240, the bleed-off portbeing normally closed when the-valve;24b is unseated,

v and vioe versa; 3

During normal operation, as has heretofore been the case, and assumingthe pneumatic relief valve 24 to be open,.compressed air will flow fromthe compressed air tank 32 through the pipes 3I 25 and 23 to theatomizers 2I until the moisture emitted from the atomizers ZI will haveproduced a desired relative humidity in the surrounding through thepassageway I42 and pipe Hi5, will be 7 partially exhausted through thepassageway I35 of. the nozzle I34. This will bleed the pipe I45 and itsassociated pipe 44 with the result that the parts of the pneumatic valve21 will assume substantially the position shown in Figure a.

With the parts of the pneumatic relay 21 in the position shown in Figure4, the spring loaded valve member 56 willbe in closed position andthe'spring loaded valve member t will be in opened position, with theresult that the compressed air from the pipe 4la will'be unable to enterthe passageway 91 (Figure 8) and, there'- fore, will fail to admitcompressed air to the pipe 26 (Figure 2). As is well known, this willcause the pneumatic relief valve 24 to close, since the air in pipe 28will escape through passageway IQI, channel 64, passageway 96 andtubular plug N30, to the atmosphere, in the course of which the spring2411 will seat the valve member Mb. This prevents compressed air fromflowing from the pipe 25 to the pipe 23 and the associated atomizers ZI.

and. the air pressure still on the atomisers side of valve housing 240is bled on through the now open bleed-off port 249.

On the other hand, upon the relative humidity of the atmospheredecreasing below a predetermined point, the hygroscopic element II1 willdecrease in length thus moving the baffle 425 against the nozzle I35 toclose its passageway I35 and to prevent the nozzle I35 from bleeding thecompressed air from the pipe I45. The compressed air from the pipe I45will then flow through'the pipe I415, passageway 543 in the projectionMI, pipe T 45 and pipe 44 to enterthe lower chamber 95 of the pneumaticrelay 21 in Figure 4. This will cause the medial portion of thediaphragm 93 to move upwardly to, in turn, cause the plunger 85 to moveupwardly against the compression spring 86. This will partially rotatethe lever 82, in a clockwise direction in Figure 4, and will cause theplate 10 to reverse its position from that shown in Figure 4 to wheretheadjustment screw 12 will move the spring loaded valve member 66 toopened position and The downward movement of the valve stem 24c alsomovesthe valve'disc 24, off its seat will permit the spring loaded valvemember 65 to move to closed position.

Compressed .air will then flow from the pipetla (Figure 8) through thepassageway 91,

through the channel 64- and thus through the passageway IIlI to the pipe26, to move stem 24c and valve members 241), 2.4g. upwardly therebyunseating valve member 2%, thus opening the pneumatic relief valve 24.This will permitcompressed air toflow from the pipe 25 through the pipe23 to the. atomizers 2| in the manner heretoiore described. I

The arrangement of thehygrostat 43 and the pneumatic relay 21 and itsoperation as heretofore described isconventional and does not constitutea part of the present invention. However.

it is with these or. similar part5 arranged in the manner describedvthat the arrangement constituting the present invention is adapted tobe, associated.

Heretofore, the pipe 44 has been connected directly to the'hygrostat 43and the pipe T 45 is provided as a means of connecting the pipe 41(Figure 2) in communicating relation to the pipe 44.

There are many types of electric-pneumatic relays which may be employedin lieu of therelay 59, shown in Figures 2' and 3, the relay 5!] beingshown by way of illustrationonly. This relay 53 may be of a type such asin manufactured by Minneapolis Honeywell Regulator Company under theirtype number RO40OA and which is commonly termed an electrically operatedpneumatic diverting relay. Since the electric-pneumatic relay is alsoindependently a conven- V tional element, the details of thiselectricpneumatic relay 50 shown in Figure 3 are given merely toillustrate its manner of operation rather than its complete structureand its description is based accordingly. This electricpneumatic relayas describedis illustrated and described'on a sheet issued by saidcompany and identified as form Number 59-1378.

The electric pneumatic relay 50 is shown, in the lower right-handportion of Figure 2, witha cover I60 mounted thereon, this cover I60being removed in Figure 3 to expose an irregularlyshaped base member IBIwhich suitably supports a cast member I52. A block 53, suitably securedto the cast member I62, has an armature I64 pivotally mounted thereon,as at I65. The armature I64 is adapted to be partially rotated in acounterclockwise direction, in Figure 3, upon a soft iron core I61 beingenergized through the medium of a magnetic coil E10 having wires Ill andI12 extending therefrom to respective terminals I13 and I14 to' whichthe respective wires 5| and 52 heretofore described are connected. Uponmovement being imparted to the armature IE4, in a manner to be laterdescribed, a relay lever I16, secured to the upper portion of thearmature I64, as by a screw I11, is caused to partially rotate in a likedirection to that of the armature I64. I

A valve lever I80, pivoted as at I8I on the cast member I62, has anoutwardly projecting leaf portion or ear I82 integraltherewith whichloaded valve member I to assume a closed posi-,

tion as shown in Figure 3. The cast member I62 has a chamber. I85therein in which the spring b i'lllid is restricted so downward'moveand-being provided with a' GOsecOnd di *P ntially-as-described in UnitedState iioaded valve member 18 5 is mounted for vertical 5 dingmovementand the'lowerend'oi the'c amu i of the se ies leaded r lic m m eW111 b s'eth mem e -1 t. Mana r av 8 w n te te i152 providescommunication between the pipe 41 5n mbr M The'c member lfiz has an openended than,-

nel 9U thereinfthe bottom .o'f which is closed bya flexibleinember or,gasket 15.! held inlplace by an -I,.-'-s'ha'ped strap iron mem e l'azsecured,

at b s ew 193; 'to' as mf btr l-i T ar we e e i a blr' ee re -b a ejustment screw? 194 which, upon "movement of the valve lever- I80 in 'aclockwise'dir'ec-tion in relay 2 to assume .the position shown inFigurei.

There are many types of time switches which may be employed-inassociation with the present in ent n, the timer 54in Fi ures 2 and 5bein shown by way of illustration only. This timer 54 may be ofatypesuch as in manufactured by Paragon Electric Company, Two Rivers,Wisconsin, un-der their number 6-817, Typeu '11 "{I-his rticulai'ftimerortime switch-is of a type subthe tim 's'witoh 544s shownii'i's'aid patentfadetailed descriptionthereof'is deemed unnecessary, itmerely being necessary hat the wires 51 and ,52 ,bej,c9nnected tosuitable putput terminals 209 andZfll and that one of the'wires 55 or'56 be connected to the terminal 200 and the other of the wires 55 or 55be connected to an input terminal 203 (Figure 5). The time switch 54should be of a type which may be adjusted to intermittently complete thecircuit to the solenoid coil I of the electric-pneumatic relay 50(Figure 3) for periods of a relatively short duration. The length of theperiods during which the coil H0 is energized and the intervalstherebetween may vary according to the atmospheric conditions andaccording to the relative humidity desired in the atmosphere of aparticular room. For example, if it is desired that the relativehumidity of the atmosphere in a particular room be held to approximatelyeighty percent, the time switch 54 should be adjusted substantially tocomplete a circuit to the magnetic coil I19 for six second periods atintervals of six seconds. The optimum periods and intervals therebetweenmay be determined by trial and error.

Thus, assuming the relative humidity of the atmosphere of the room shownin Figure 1 to have reached the desired percentage of, say, eightypercent, the hygrostat 43 (Figures 2 and 6) will bleed the compressedair from the pipes I46 and 44 in the manner heretofore described,

. 10 atm s eresurround ng th win ers Z1. and the y i 's'tt 14,3; a inbtlQW tll i e i qd htt' t ei th v m tst .3 w'ma a'm b bi s d'e t j2.19.,

5 h'yerd tstiiiandthrqueh hi rlp 1'8- av- 21 Fi ure 41 au itsnemit ornts ed ai to" flevf 'm h .r p 911 i ures and 8 th su h thern smet t rt ay2. the pipe an the. inter osed relive 69" the, Pneumat re ie valve; 124to a ai mit qu r iesst eir a ead.-

) i ma netic 99. n (Fi t"e1a'y tnu i i flielav .5"- i n t be t ie fiivss ed "t9 the hyerostet 143 9 ue'pe f ds 11.I whic 1. 'befil 1121.5" othe lir sta s 191? mess e msn ithths n zzi mw r r. p n t baffle J meviai tesetrziiitte'rit ly openihg fand"'clos i ii g the pneu atic'reliefvalv 2436i predetermined relativlyshort intervals during theperiod at which the relief valve normally remains open, with the resultthat the moisture emitted from the atomizers may be homogeneouslydispersed throughout the room in which the atomizers' are disposed and,in so doing, produce the desired effect on the hygroscopic element II!which, heretofore, has caused the pneumaticreliei valve 24 to close fora substantially longer period than the period at which it is closedthrough the medium of the electricpneumatic relay 50 and the cooperatingtime switch 54 or until the relative humidity has again dropped below apredetermined percentage. This will prevent the atomizers 2! fromsaturatingthe atmosphere immediately adjacent the same before therelative humidity of the atmosphere adjacent the hygrostat 43 will havereached the desired percentage to effect the closing of the pneumaticrelief valve 24.

In the drawings and specification there has been setforth a preferredembodiment of the invention and although specific terms are employed,they are used in a generic and descriptive sense only and not forpurposes of limitation, the scope of the invention being defined in theclaim.

I claim:

In a humidity controlling system having a plurality of pneumaticallycontrolled moisture emitting atomizers, a first pipe connectionv betweena source of compressed air and the atomizers, a normally closedblow-through valve of a type having a by-pass to the atmosphere for theatomizers when the valve is closed interposed in the first pipeconnection, a hygrostat, a second easement with t e 13952151 54 ri r i Vr enteringthe ii A pipe connection'betweenthe hygrcstat and the sourcevof compressed air, a snap-acting pneubetween the pneumaticfrelay andthe blowthrough valve, means on said hygrostat for admitting compressedair' from the second pipe con- .nection to the third pipe connectionduring periods of relative humidity below a predetermined .percentage,means on the pneumatic relay for instantly effecting communicationbetween the ,fourth and the fifthpipe connections when compressed air isadmitted to the pneumatic relay through the third pipe connection, meansfor opening said .blow-throughvalve upon compressed air being admittedthereto from: the source of compressed airthrough the fourth and fifthpipe .connectionsto thus permit compressed air to flow to the atomizers,said hygrostat also being operable to prevent compressed air fromflowing from the second pipe connection 'to the third pipe connectionand thus to the pneumatic relay and simultaneously exhausting thecompressed air from the third pipe connection during periods of relativehumidity above said predetermined percentage, means on the pneumaticrelay for instantly preventing communication between the fourth andfifth pipe connections and simultaneously exhausting the compressed air.from the fifth pipe connection upon the compressed air being exhaustedfrom the third pipe connection to close the connection effected by theblow-through valve between the source of compressed air and theatomizers andto thereby permit the pressure in the atomizers to beexhausted through the blow-through valve to immediately close-the Vatomizers, the combination of an electric-pneustates nection between asource of electrical energy and the time switch, a second electricalconnection between the time switch and the electric-pneumatic relay, asixth pipe connection between the electric-pneumatic relay and the thirdpipe connection, means on the time switch for intermittently energizingthe electric-pneumatic relay, means on the electric-pneumatic relaynormally closing the sixth pipe connection and means on theelectric-pneumatic relay responsive toenergization thereof for openingthe sixth pipe connection to thereby exhaustcompressed air from thethird pipe connection at intermittent intervals of relatively shortduration during the periods in which the hygrostat is permittingcompressed air to flow to the third pipe connectio-nto thereby preventcompressed air from flowing between the fourth and fifth pipeconnections through the pneumatic relay intermittently to accordinglycontrol the operation of the blow-through valve to thus insurehomogeneous dispersion of moisture from the atomizers into the roominwhich they are disposed.v V

GEORGE W; BASINGER.

REFERENCES CITED The following references are of record in the file ofthis patent:

Great Britain May 26, 1948

